A Robust Strontium Tweezer Apparatus for Quantum Computing

Abstract

Neutral atoms for quantum computing applications show promise in terms of scalability and connectivity. We demonstrate the realization of a versatile apparatus capable of stochastically loading a 5x5 array of optical tweezers with single ${}^{88}$Sr atoms featuring flexible magnetic field control and excellent optical access. A custom-designed oven, spin-flip Zeeman slower, and deflection stage produce a controlled flux of Sr directed to the science chamber. In the science chamber, featuring a vacuum pressure of $3\times 10^{-11}$ mbar, the Sr is cooled using two laser cooling stages, resulting in $\sim 3\times 10^5$ atoms at a temperature of 5(1) $\hat{I}¼$K. The optical tweezers feature a $1/e^2$ waist of 0.81(2) $\hat{I}¼$m, and loaded atoms can be imaged with a fidelity of $\sim 0.997$ and a survival probability of $0.99_{-0.02}^{+0.01}$. The atomic array presented here forms the core of a full-stack quantum computing processor targeted for quantum chemistry computational problems.

12 pages, 10 figures